update github actions

Author: pnavaro

.github/dependabot.yml

@@ -0,0 +1,7 @@
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"

.github/workflows/book.yml

@@ -2,7 +2,7 @@ name: book
 on:
   push:
     branches:
-      - master
+      - main
 jobs:
   build-and-deploy:
     runs-on: ubuntu-latest